Graduate Thesis Or Dissertation
 

Airphoto analysis of estuarine circulation

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6d570035m

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  • Aerial photography has become a valuable method of acquiring information on estuarine current circulation patterns. The method provides a comprehensive picture of nearly simultaneous surface water movements. It represents a significant improvement over conventional surface float and current meter methods because large areas may be covered in great detail with limited personnel and equipment. The goals of this study include the development and documentation of methodology for evaluating and displaying surface current velocities and two dimensional diffusion coefficients using dye tracers, oblique aerial photography and digital computers. Field procedures and data reduction techniques have been tested and modified in an attempt to provide a maximum amount of useful data with a minimum expenditure of manpower and materials. The study has demonstrated that fluorescent dye tracers, placed in articulated streaks, are conveniently deployed, easily interpreted photographically, conservative with respect to dye wastage and useful for diffusion studies as well as current studies. Individual oblique aerial photographs have been utilized in preference to stereo or vertical photogrammetric methods to eliminate reflected light problems and to allow the use of available aircraft and photographic equipment. Greater course variation and low altitude flights are permissible under some cloud covers that could otherwise preclude the use of other aerial photo methods. Digital computer procedures are described which analyze aerial photo data by (1) determining the six parameters of the camera and photograph orientation based on initial approximations of position and angular rotation and (2) calculating magnitudes and directions of currents and approximate diffusion rates. Computer graphic techniques are presented which are used to display estuary boundaries, velocity vectors and dye patch outlines. This report is intended to become a user's manual for the application of the Oregon State University photogrammetric equipment. However, the principles involved and the methodology described are general and can be readily applied by the reader in designing his own system for determining estuarine circulation patterns through the use of air photo imagery.
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